You're flying ahead of your pet and wondering: do the original documents need to go with them, or can the transport company work from scanned copies?
The short answer is: originals travel with your pet. But the nuances are worth understanding.
What needs to be original
The export health certificate - EHC 2580 for UK dogs, EHC 2432 for UK cats, the equivalent CFIA or USDA-endorsed certificate for other countries - must be the original signed and stamped document. DAFF requires the original to travel with the animal as manifest cargo. Copies are not accepted at the Australian end.
Most agents and vets will also require original vaccination records - particularly the rabies certificate - at the final health check appointment. Some vets will accept certified copies of secondary documents, but won't accept copies of the primary vaccination history.
What you can keep copies of
Keep a full set of scanned copies of everything before your pet travels: the health certificate, all laboratory reports, the RNATT declaration, the import permit, vaccination records, and any identity declarations. These are your backup if anything is lost or delayed in transit, and you'll need them for your own records when collecting your pet from Mickleham.
Best practice
Ask your transport agent and the vet signing the final health certificate what their specific requirements are, at least a week before travel. The answer varies slightly by agent and vet. Getting this confirmed early removes one thing from your mental load on collection day.